diff --git a/CHANGELOG.md b/CHANGELOG.md
index 632350f..0082e88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,11 @@ instructions, because git commits are used to generate release notes:
 
 <!-- scriv-insert-here -->
 
+<a id='changelog-20.0.0'></a>
+## v20.0.0 (2025-06-05)
+
+- 💥[Feature] Upgrade to Teak. (by @jfavellar90)
+
 <a id='changelog-19.0.2'></a>
 ## v19.0.2 (2025-03-12)
 
diff --git a/pyproject.toml b/pyproject.toml
index 82432c3..a97b394 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
 ]
 dependencies = [
-  "tutor>=19.0.0,<20.0.0",
+  "tutor>=20.0.0,<21.0.0",
 ]
 
 # These fields will be set by hatch_build.py
@@ -35,7 +35,7 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 dev = [
-    "tutor[dev]>=19.0.0,<20.0.0",
+    "tutor[dev]>=20.0.0,<21.0.0",
     "black",
     "pylint"
 ]
diff --git a/tutornotes/__about__.py b/tutornotes/__about__.py
index 14d428a..9c9eb91 100644
--- a/tutornotes/__about__.py
+++ b/tutornotes/__about__.py
@@ -1 +1 @@
-__version__ = "19.0.2"
+__version__ = "20.0.0"
diff --git a/tutornotes/templates/notes/build/notes/Dockerfile b/tutornotes/templates/notes/build/notes/Dockerfile
index 7bd90db..34752a2 100644
--- a/tutornotes/templates/notes/build/notes/Dockerfile
+++ b/tutornotes/templates/notes/build/notes/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.4
+# syntax=docker/dockerfile:1
 FROM docker.io/ubuntu:24.04
 
 ENV DEBIAN_FRONTEND=noninteractive
@@ -7,17 +7,17 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN userdel -r ubuntu
 
 RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
-  --mount=type=cache,target=/var/lib/apt,sharing=locked \
-  apt update && \
-  apt upgrade -y && \
-  apt install -y \
-    language-pack-en \
-    git \
-    python3 \
-    python3-pip \
-    python3-venv \
-    libmysqlclient-dev \
-    pkg-config
+    --mount=type=cache,target=/var/lib/apt,sharing=locked \
+    apt update && \
+    apt upgrade -y && \
+    apt install -y \
+        language-pack-en \
+        git \
+        python3 \
+        python3-pip \
+        python3-venv \
+        libmysqlclient-dev \
+        pkg-config
 RUN ln -s /usr/bin/python3 /usr/bin/python
 
 ###### Git-clone Notes repo ######
@@ -34,8 +34,13 @@ ENV PATH=/app/venv/bin:${PATH}
 # https://pypi.org/project/setuptools/
 # https://pypi.org/project/pip/
 # https://pypi.org/project/wheel/
-RUN --mount=type=cache,target=/app/.cache/pip,sharing=shared pip install setuptools==75.2.0 pip==24.2 wheel==0.44.0
+RUN --mount=type=cache,target=/app/.cache/pip,sharing=shared pip install setuptools==78.1.0 pip==25.0.1 wheel==0.46.0
 RUN --mount=type=cache,target=/app/.cache/pip,sharing=shared pip install -r requirements/base.txt
 
 EXPOSE 8000
-CMD gunicorn --workers=2 --name notes --bind=0.0.0.0:8000 --max-requests=1000 notesserver.wsgi:application
+CMD ["gunicorn", \
+    "--workers=2", \
+    "--name", "notes", \
+    "--bind=0.0.0.0:8000", \
+    "--max-requests=1000", \
+    "notesserver.wsgi:application"]